The spherules, which the team called blueberries, showed clear signs of having been built up layer by layer within sediments, just like the pearls in our oceans.

• 这些被工作人员称为"蓝莓"的小球，表现出是由沉淀物层层沉积而形成的显著迹象，就如同海洋中的珍珠。